I think you should use flights to finish all of the sections. From Shenzhen to Zibo, please take a flight to Jinan Airport firstly and then take a bus to Zibo. And aslo use the Airport to Hangzhou. From Hangzhou to Hong Kong, you could use the directly flight between them. Alternatively, you could fly to Shenzhen and then go to Hong Kong. The ticket fare is much cheaper by this way.